Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Amortized Cost, Due in less than one year	$ 101
Available for Sale, Amortized Cost, Due after one year through five years	818
Available for Sale, Amortized Cost, Due after five years through ten years	743
Available for Sale, Amortized Cost, Due after ten years	5,025
Available for Sale, Amortized Cost, Total	6,687
Available for Sale, Fair Value, Due in less than one year	101
Available for Sale, Fair Value, Due after one year through five years	833
Available for Sale, Fair Value, Due after five years through ten years	762
Available for Sale, Fair Value, Due after ten years	5,287
Available for Sale, Fair Value, Total	6,983
Gross Amortized Cost, Securities Available for Sale	661,862	637,940
Fair Value, Available for Sale	650,445	643,050
Mortgage-Backed Securities of U.S. Government Sponsored Entities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Amortized Cost, Securities Available for Sale	136,184	186,404
Fair Value, Available for Sale	134,042	189,255
Collateralized Mortgage Obligations of U.S. Government Sponsored Entities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Amortized Cost, Securities Available for Sale	385,832	352,731
Fair Value, Available for Sale	376,523	354,259
Privately Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Amortized Cost, Securities Available for Sale	29,754
Fair Value, Available for Sale	29,112
Private Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Amortized Cost, Securities Available for Sale	70,845	96,258
Fair Value, Available for Sale	71,451	96,931
Collateralized Loan Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Amortized Cost, Securities Available for Sale	32,560
Fair Value, Available for Sale	32,334
No Contractual Maturity [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Amortized Cost, Securities Available for Sale	0
Fair Value, Available for Sale	$ 0

Available for sale securities debt maturities aggregate fair value.

No definition available.

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- Definition

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

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- Definition

Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at fair value maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year.

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- Definition

Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at fair value maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year.

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Amount of available-for-sale debt securities at fair value maturing after the tenth fiscal year following the latest fiscal year.

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Amount of available-for-sale debt securities at cost, net of adjustments, which include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing after the tenth rolling twelve months following the latest balance sheet presented. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at fair value maturing in the next fiscal year following the latest fiscal year.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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